Attachment for milling-machines.



Patented Aug.23, 1910.

0.1. GROHMANN. ATTACHMENT FOR MILLING MACHINES.

APPLICATION FILED JULYZB, 1908.

' Witnesses:

G. L. GROHMANN.

ATTACHMENT FOR MILLING MACHINES.

- APPLIUATION FILED JULY 2a, 1908.

Patented Aug. 23, 1910.

I Fig. 5

far a? Wtnesses: 'lzwen tar: I

W Chill. Grab/mania Wz/ By kz'sAtzfiarneys;

' G. L. GROHMANN. ATTACHMENT FOR MILLING MACHINES.

'AYPLIOATION TILED JULY 28, 1908.

Patented Aug. 23, 1910.

3 SHEETS-r-SHEET 3.

Witnesses" WW MM Chi-ll By his Attorneys;

Inventor:

a UNITED. STATES}- PATENT OFFICE.

CARL L. GROHMANN, OF HARTFORD, CONNECTICUT, ASSIGNOR T0 PRATT & WHITNEY COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF NEW JERSEY.

ATTACHMENT FOR MILLING-MACHINES.

"Specification of Letters Patent.- Patented Aug, 23, 191'() V Application filed July 28, 1908 Serial No. 445,751.

To all whom it may concern:

Hartford, in the countyof Hartford and- State of Connecticut, have invented certain new and useful Improvements in Attachments for Milling-Machines, of which the following is a specification.

This invention relates to-attachments for milling-machines, the object of the invention being to provide an efiective article of the character set forth which can be readily and quickly applied to a milling machine and by which the output of the latter may be increased.

In the drawings accompanying and forming part of this specification I illustrate in full one convenient form of embodiment of the invention which to enable those skilled in the art to practice the same willbe set forth in detail in the following description while the novelty of the invention will be included in the claims succeeding said description.

Referring to said drawings, Figure l is a front elevation of an attachment involving my invention. Fig. 2 is a top-plan view of said attachment, fastening screws being shown in section. Fig. 3 is a central, vertical section of the same and shows by dotted out-line .portions of a milling machine of standard make. Fig. 4 is a horizontal section on the line 4-4, Fig. 1. Fig. 5 a sectional detail of a connecting link hereinafter described, and, Fig. 6 is a detail view of a spindle, gear and certain associated parts also hereinafter described.

Like. characters refer to like parts throughout the several views of the drawings which it willbe perceived are on different scales.

In Fig. 3 of the drawings I have represented by dotted lines the spindle and bearing or sleeve in which said spindle turns, these being parts of a vertical spindle milling machine of known form, the spindle being designated by 2 and. the bearing or sleeve therefor by3, the latter being carried upon for convenience. So also it'ls conceivable that certain'portions of the device or all of them if necessary may be made as a permanent part of a metal-working machine of whatever nature it may be.

The framework or carrier for the differ ent operative parts of the attachment is preferably made in the form of a casing or boxing whereby the different parts will be protected from various influences and said casing or boxing involves in its make up a sleeve as 4 and a shell as 5 shown as held together'by several screws as 6 and also by a spindle as 7. The spindle 7 serves a double function; it aids inholding the two sections 4 and 5 of the casing together and also as a center for a gear hereinafter described. The spindle 7 .is passed downwardly through the upper casing member or sleeve 4 its lower portion being tapped into the shell 5 and it has between its end an enlargement 8 the top of which presents a shoulder and bears against the under side of the sleeve 4. On the upper portion of said spindle 7 is threaded a nut as 9.fitted in a counterbore in the top of the sleeve 4. By

turning the spindle to the right the lower face or base of the enlargement or collar 8 will be caused to bind solidly against the top of the shell 5 while by similarly turning the nut 9 the top of said collar'or enlargement will be brought equally firmly against the under side of the sleeve 4. Owing to the presence of the cutter spindles at the frontof the attachment it is not possible to employ screws such as 6 for uniting thereat the sleeve 4 and shell 5; this function is effectively performed by the spindle 7.

As will hereinafter appear the attachment has several cutter spindles and these may be driven in any desirable manner, for example from an arbor as 10. This arbor as will hereinafter appear constitutes also a coupspindles being operatively connected with this driving member it is apparent that when-said'couplingis' efi'ected and when the milling machine spindle is in action the'cutter spindles will be also operated. The arbor I0 isa familiar device in millin 'machines-and it is connected with the spindles thereof inthe well-known manner for which reason these'points need receive no consideration herein.

The arbor 10 extends through and is keyed to a gear as 11 which constitutes a suitable driving member for effecting the operation to which allusion has been made. The gear 11 hasan elongated pendent hub 12 which receives the lower portion of the arbor 10 and which extends downward through the shell 5, a nut .13 being threaded onto the lower end of said hub, and a washer 14 subserving its usual purpose being interposed between the nut and shell. The hub 12 turnsin a bushing 15. It will be apparent that the gear 11 is inclosed by the shell 5. As will hereinafter appear there are three trains of gears and the gear 11 is common to all said trains being in each instance the first one thereof. I employ three trains of gears as l illustrate three cutter spindles;' the number of trains, however, Wlll depend on the number of cutter spindles which are incorporated in a given attachment; It is of course not essential that I employ intermeshing 'gears for driving the cutter spindles; they are advantageous though in that regularity and prcciseness of action are assured. V

The gear 11 is shown as beingin mesh with a pinion 16 loose or rota-tiveupon the.

collar or enlargement 8. The pinion 16in turn meshes with a pinion as 17 keyed or otherwise suitably rotatively connected with a cutter spindle as 18 represented as extending entirely through the sleeve 19, which is complemental of sleeves as 20 and 21. In the present case the sleeve 19 has no provision for lateral movement although the outer sleeves have by virtue of which the spindles 22 and 23 can be moved toward and from the companion spindle. The sleeves 19, 20 and 21 are alike in construction except for the adjustment, to which I have referred so that a detailed description of one will suflice for the others and in this connection particular attention is'invited to Fig. 3 where the sleeve 19 is shown in detail. The sleeve, 19 is shown as having on the inside thereof a V or dovetail tongue as 24 fitted in a correspondingly shaped groove as 25 formed by the shell 5 and by a plate as 26 which extends entirely across the underside of said shell and is united thereto by screws as 26. The sleeve or bearing 19 does not move sidewise but the shells"20 and 21 do and along a straight path. Prior to adjusting the outer sleeves 20 and 21 the screws 26 will be loosened as will also other screws hereinafter described whereby the sleeves 20 and 21 can be freely shifted laterally and when adjusted all said screws will be set so as to.maintain the adjustment. The tongue 24 of the intermediate or middle sleeve 19 is also clamped when said screws are tightened thereby effectually preventing lateral motion of such intermediate sleeve as well as the outer sleeves.

The construction, mounting and endwise adjustment of the three cutter spindles 18, 22 and 23 are the same so that a detailed description of these features of one of the spindles will apply to the other two and reference may be had for this purpose to Fig. 3 where the spindle .18 and its adjuncts are represented in detail. Thespindle 18 is illustrated as provided near its lower end with a circumferential flange 27 between which and the shell 5 a washer 28 serving itsusual function, is placed and as also having a tapered socket 29 to receive a correspondmgly-shaped collet 30in which theshank31 of the cutter 31' is removably clamped; For convenience I have adopted similar characters for the outer cutters and their shanks. The lower threaded portion of the spindle 18 is embraced by a nut 32 which wise adjustment of the shank31. Around the upper portion of the-spindle 18 is a split nut 34 through which is passed a'lockmg pin or screw 35, the pinion 17 being located 3 between said nut 34 and a washer as 36 surrounding the upper reduced portion of the spindle 18 and resting on the top of the sleeve 19. By turning the nut '34: to the right said spindle l8 can be drawn upward to compensate for wear therein or in the pinion 17 and when such action is concluded thepin or screw 35 will be operated to firmly lock the nut 34 against displacement.

The spindle 18 is represented as hollow or tubular and through the same extends an adjusting device shown as an elongated pin 37 the upper threaded endof which engages coeperating threads. on the inside. of said hollow spindle 18 while the lower end thereof abuts against the top of theshank 31. To effect the longitudinal adjustment of the said shank 31 and the consequent raising or lowering of the cutter 31, the collet 33 will be freed from the shank in the manner hereinbefore described. Should itbe desired tolower the cutter 31 the pin 37 will be run down while should it bedesired to elevate the cutter the reverse operation of said adjusting pin will be caused. On the lowering of the pin 37 the cutter shank 31 is of course depressed while when the said pin is elevated its lower end leaves the shank 31 and when the requisite movement of the pin has been effected the shank will be raised to engage against the pin. To facilitate its operation the upper end of the longitudinally-movable adjusting pin 37 may be rovided with a knurled operating head 37 The outer spindles 22 and 23 are provided with pinions as 17 and 17" keyed or other: wise suitably connected thereto and which in the present instance are counterparts of the pinion 17, the three pinions 17,17 and 17" constituting the outer terminal members of the gear trains to which I have hereinbefore referred. To protect these three pinions I may provide a guard-plate as 38 fastened suitably to the upper front portion of the shell 5, the horizontal portion of said guard plate having slots for the pas- .sage of the spindles 18, 22 and 23, and the outer slots being elongated sufliciently to permit the lateral adjustment of the outer spindles. The spindles as will be apparent" are arranged in .a row and in the embodiment of the invention shown, the outer spindles are laterally adjustable to permit them being moved bodily toward and from the intermediate spindle. One only of the outer spindles might be adjusted while both can be should occasion require. The driving means for the several spindles is such that the spindles are always in operative relation with said driving means as will hereinafter appear although of course I do not restrict myself to this particular form of driving means. It is advantageous, however, in that the only thing necessary to' change an adjustment is to simply shift the spindle laterally or spindles should both be adjusted. The driving means also is of such character that all three spindles are driven together. Vith an attachment having three spindles I can triple the work of a single spindle milling machine provided all three cutters are in simultaneous use. The lateral adjustment of the spindles is preferably considerable thereby adapting the device to a wide range of Work. The adjustment of the outer spindles is also independent; that is the spindle 22 can be moved toward and from the spindle 19 without affecting the spindle 23 and vice versa. It will be observed that the three spindles 18, 22 and 23 are disposed in a row and that the outer spindles 22 and 23 are adjustable toward and from the intermediate spindle 18 in a direction corresponding with the disposition of the row and that finally the row of spindles is disposed at one side of the arbor 10. r

The pinion 17 is represented as meshing with a gear 39 which in turn meshes with the master gear 11, said three gears presenting the second of the trains to which reference has been made. The gear 39 a duplicate of the gear 39 meshes with the gears 11 and 17", the gears 11, 39 and 17" presenting the third train. The gears 39, 16 and 39 constitute as will be apparent idlers and are situated between the sleeve 4 and shell 5. It will therefore be obvious that when the arbor 10 is connected with the milling-machine spindle. 2 and when the attachment is properly mounted the three cutters 31 will be rotated in unison. It might be stated that the cutters are of a familiar form being adapted for channeling work. Cutters of a radically different form might be employed.

The arbor 10 serves as a center for the links 40 and 40', the inner ends of said links being loosely connected with the bushing 15 for swingin movement for a reason that will hereina er appear. The outer ends of said links are preferably in the same'horizontal plane and this result can be easily accomplished by bendin the outer portion of the link 40 downwar 1y asshown in Fig. 5.

In addition to the links 40 and 40 there is a second pair of links as 41 and 41 connected at their inner ends flexibly with the outer ends of the links 40 and 40' respectively. The pivots for flexibly connecting the two pairs of links are shown as consisting of spindles or ins as 42 and 42' which loosely carry the id er gears 39 and 39' hereinafter described. The outer ends of the links 41 and 41 are loosely connected with the spindles 22 and 23. The links 40 and 40 swing about an axis common to that of the arbor 10 while the links 41 and 41 swing about the axes of the gears 39 and'39 or about the longitudinal axes of the spindles 42 and 42 respectively. The spindles 42 and 42 extend through arcuate slots 43 and 1 43 respectively in the shell 5, their lower ends being located in chambers as 44 cored in the under side of the shell 5 and receiving holding nuts as 45 which by engaging against the roofs of the respective chambers 45 firmly clamp the links in their adjusted positions and naturally aid in holding the 'outer spindles 22 and 23 in their adjusted positions. Said slots are on axes struck from the longitudinal axis of the arbor 10. The linkage means to which I have referred provides a simple and efiective means for always maintaining the gears of the two .outer trains in mesh. No matter to what extent the outer spindles 22 and 23 may be shifted, within the range of the device of course, there will always be a driving relation between said spindles and the primary or master driving member 11.

The sleeve 4 at its top is represented as furnishedwith an outwardly extending flange 46 which provides a simple means, in connection with screws, foruniting the-attachment solidly to the milling machine spindle bearing 3, screws as 47 being shown for the purpose and the under side of the bearing 3 has appropriately placed tapped holes to receive these four screws which extend through openings &8 in said flange 46, two of the openings being made as 0 enended slots tofacilitate the mounting o the attachment.

What I claim is:

1. An attachment for milling machines comprising a carrier or frame member, an arbor on said carrier or frame member, a link to turn on said arbor, a second link -pivoted to the first link, a plurality of spindles on the carrier one of which 15 adjustable toward and from the other, said second link being connected pivotally with the adjustable spindle, means for clampin the pivot which connects said links to sai carrier or frame member, and operative connections between the arbor and said spindles.

2. An attachment for milling machines comprising a carrier or frame member, an arbor supported by said carrier or frame member a link which pivots on said arbor, a second rality of spin les one of which is adjustable toward and from another, gear trains between said arbor and said spindles one of the gears being supported by the pivot congether a groove, a

sleeves rotatlvely receiv ng sa d spmdles and 1 link ivoted to the first link, a plu-' tion with said pivot for drawing the same into clamped engagement with said carrier or frame member.

3. An attachment for milling machines comprising a carrier, a plurality of spindles sup' orted by said carrier, the carrier having a c am-ping late and the body of the carrier and sai clamping plate presenting topluralit of spindles,

provided with tongues fittin in said roove at least one tongue being a justable 'm the groove, a driving member operatively connected with said spindles for operating the same, and acoupling member in driving relation with said" driving member and adapted for detachable connection with the spindle of a milling machine. 4

In testimon whereof I in presence 0 two witnesses. CARL L. GROHMANN.

Witnesses W. M. S'roRns,

C. M. GELLERT.

aflix my signature 

